Shareholder Report, Line Graph (Details) 190991_Buffalo High Yield Fund_Investor Class_TSR Annual {Investor Class} - USD ($) |
12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
Mar. 31, 2022 |
Mar. 31, 2021 |
Mar. 31, 2020 |
Mar. 31, 2019 |
Mar. 31, 2018 |
Mar. 31, 2017 |
Mar. 31, 2016 |
Mar. 31, 2026 |
|
| Investor Class | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Buffalo High Yield Fund Investor Class | ||||||||||
| Accumulated Value | $ 16,552 | $ 15,427 | $ 13,765 | $ 13,994 | $ 13,724 | $ 10,800 | $ 11,571 | $ 11,184 | $ 10,837 | $ 10,000 | $ 17,304 |
| Bloomberg U.S. Universal Bond Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Universal Bond Index | ||||||||||
| Accumulated Value | 11,777 | 11,190 | 10,899 | 11,426 | 11,931 | 11,589 | 10,815 | 10,346 | 10,192 | 10,000 | $ 12,324 |
| ICE BofA U.S. High Yield Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Index | ||||||||||
| Accumulated Value | $ 16,867 | $ 15,665 | $ 14,097 | $ 14,608 | $ 14,651 | $ 11,882 | $ 12,839 | $ 12,119 | $ 11,688 | $ 10,000 | $ 18,044 |